Vacuum flask



FIG. 1 is a front elevational view of the vacuum flask in accordance with a first embodiment, the rear elevational view being a mirror image thereof;

FIG. 2 is a left side elevational view of the vacuum flask in accordance with a first embodiment;

FIG. 3 is a right side elevational view of the vacuum flask in accordance with a first embodiment;

FIG. 4 is a top plan view of the vacuum flask in accordance with a first embodiment;

FIG. 5 is a bottom plan view of the vacuum flask in accordance with a first embodiment;

FIG. 6 is a perspective view of the vacuum flask in accordance with a first embodiment;

FIG. 7 is a front elevational view of the vacuum flask in accordance with a second embodiment, the rear elevational view being a mirror image thereof;

FIG. 8 is a left side elevational view of the vacuum flask in accordance with a second embodiment;

FIG. 9 is a right side elevational view of the vacuum flask in accordance with a second embodiment;

FIG. 10 is a top plan view of the vacuum flask in accordance with a second embodiment;

FIG. 11 is a bottom plan view of the vacuum flask in accordance with a second embodiment;

FIG. 12 is a perspective view of the vacuum flask in accordance with a second embodiment;

FIG. 13 is a front elevational view of the vacuum flask in accordance with a third embodiment, the rear elevational view being a mirror image thereof;

FIG. 14 is a left side elevational view of the vacuum flask in accordance with a third embodiment;

FIG. 15 is a right side elevational view of the vacuum flask in accordance with a third embodiment;

FIG. 16 is a top plan view of the vacuum flask in accordance with a third embodiment;

FIG. 17 is a bottom plan view of the vacuum flask in accordance with a third embodiment; and,

FIG. 18 is a perspective view of the vacuum flask in accordance with a third embodiment. 

The ornamental design for a vacuum flask, as shown and described. 